Xlib − C Language X Interface
X Window System Standard
X Version 11, Release 6.7
James Gettys
Cambridge Research Laboratory
Digital Equipment Corporation
Robert W. Scheifler
Laboratory for Computer Science
Massachusetts Institute of Technology
with contributions from
Chuck Adams, Tektronix, Inc.
Vania Joloboff, Open Software Foundation
Hideki Hiura, Sun Microsystems, Inc.
Bill McMahon, Hewlett-Packard Company
Ron Newman, Massachusetts Institute of Technology
Al Tabayoyon, Tektronix, Inc.
Glenn Widener, Tektronix, Inc.
Shigeru Yamada, Fujitsu OSSI
The X Window System is a trademark of The Open Group.
TekHVC is a trademark of Tektronix, Inc.
Copyright © 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996, 2002 The Open Group
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documenta-
tion files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom
the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Soft-
ware.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTIC-
ULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR
ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTH-
ERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to pro-
mote the sale, use or other dealings in this Software without prior written authorization from The Open Group.
Copyright © 1985, 1986, 1987, 1988, 1989, 1990, 1991 by Digital Equipment Corporation
Portions Copyright © 1990, 1991 by Tektronix, Inc.
Permission to use, copy, modify and distribute this documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appears in all copies and that both that copyright notice and this permission
notice appear in all copies, and that the names of Digital and Tektronix not be used in in advertising or publicity per-
taining to this documentation without specific, written prior permission. Digital and Tektronix makes no representa-
tions about the suitability of this documentation for any purpose. It is provided ‘‘as is’’ without express or implied war-
ranty.
Acknowledgments
The design and implementation of the first 10 versions of X were primarily the work of three
individuals: Robert Scheifler of the MIT Laboratory for Computer Science and Jim Gettys of Dig-
ital Equipment Corporation and Ron Newman of MIT, both at MIT Project Athena. X version 11,
however, is the result of the efforts of dozens of individuals at almost as many locations and
organizations. At the risk of offending some of the players by exclusion, we would like to
acknowledge some of the people who deserve special credit and recognition for their work on
Xlib. Our apologies to anyone inadvertently overlooked.
Release 1
Our thanks does to Ron Newman (MIT Project Athena), who contributed substantially to the
design and implementation of the Version 11 Xlib interface.
Our thanks also goes to Ralph Swick (Project Athena and Digital) who kept it all together for us
during the early releases. He handled literally thousands of requests from people everywhere and
saved the sanity of at least one of us. His calm good cheer was a foundation on which we could
build.
Our thanks also goes to Todd Brunhoff (Tektronix) who was ‘‘loaned’’ to Project Athena at
exactly the right moment to provide very capable and much-needed assistance during the alpha
and beta releases. He was responsible for the successful integration of sources from multiple
sites; we would not have had a release without him.
Our thanks also goes to Al Mento and Al Wojtas of Digital’s ULTRIX Documentation Group.
With good humor and cheer, they took a rough draft and made it an infinitely better and more use-
ful document. The work they have done will help many everywhere. We also would like to thank
Hal Murray (Digital SRC) and Peter George (Digital VMS) who contributed much by proofread-
ing the early drafts of this document.
Our thanks also goes to Jeff Dike (Digital UEG), Tom Benson, Jackie Granfield, and Vince Orgo-
van (Digital VMS) who helped with the library utilities implementation; to Hania Gajewska (Dig-
ital UEG-WSL) who, along with Ellis Cohen (CMU and Siemens), was instrumental in the
semantic design of the window manager properties; and to Dave Rosenthal (Sun Microsystems)
who also contributed to the protocol and provided the sample generic color frame buffer device-
dependent code.
The alpha and beta test participants deserve special recognition and thanks as well. It is signifi-
cant that the bug reports (and many fixes) during alpha and beta test came almost exclusively
from just a few of the alpha testers, mostly hardware vendors working on product implementa-
tions of X. The continued public contribution of vendors and universities is certainly to the bene-
fit of the entire X community.
Our special thanks must go to Sam Fuller, Vice-President of Corporate Research at Digital, who
has remained committed to the widest public availability of X and who made it possible to greatly
supplement MIT’s resources with the Digital staff in order to make version 11 a reality. Many of
the people mentioned here are part of the Western Software Laboratory (Digital UEG-WSL) of
the ULTRIX Engineering group and work for Smokey Wallace, who has been vital to the
project’s success. Others not mentioned here worked on the toolkit and are acknowledged in the
X Toolkit documentation.
Of course, we must particularly thank Paul Asente, formerly of Stanford University and now of
Digital UEG-WSL, who wrote W, the predecessor to X, and Brian Reid, formerly of Stanford
University and now of Digital WRL, who had much to do with W’s design.
Finally, our thanks goes to MIT, Digital Equipment Corporation, and IBM for providing the envi-
ronment where it could happen.
Release 4
Our thanks go to Jim Fulton (MIT X Consortium) for designing and specifying the new Xlib
functions for Inter-Client Communication Conventions (ICCCM) support.
We also thank Al Mento of Digital for his continued effort in maintaining this document and Jim
Fulton and Donna Converse (MIT X Consortium) for their much-appreciated efforts in reviewing
the changes.
Release 5
The principal authors of the Input Method facilities are Vania Joloboff (Open Software Founda-
tion) and Bill McMahon (Hewlett-Packard). The principal author of the rest of the international-
ization facilities is Glenn Widener (Tektronix). Our thanks to them for keeping their sense of
humor through a long and sometimes difficult design process. Although the words and much of
the design are due to them, many others have contributed substantially to the design and imple-
mentation. Tom McFarland (HP) and Frank Rojas (IBM) deserve particular recognition for their
contributions. Other contributors were: Tim Anderson (Motorola), Alka Badshah (OSF), Gabe
Beged-Dov (HP), Chih-Chung Ko (III), Vera Cheng (III), Michael Collins (Digital), Walt Daniels
(IBM), Noritoshi Demizu (OMRON), Keisuke Fukui (Fujitsu), Hitoshoi Fukumoto (Nihon Sun),
Tim Greenwood (Digital), John Harvey (IBM), Hideki Hiura (Sun), Fred Horman (AT&T),
Norikazu Kaiya (Fujitsu), Yuji Kamata (IBM), Yutaka Kataoka (Waseda University), Ranee
Khubchandani (Sun), Akira Kon (NEC), Hiroshi Kuribayashi (OMRON), Teruhiko Kurosaka
(Sun), Seiji Kuwari (OMRON), Sandra Martin (OSF), Narita Masahiko (Fujitsu), Masato
Morisaki (NTT), Nelson Ng (Sun), Takashi Nishimura (NTT America), Makato Nishino (IBM),
Akira Ohsone (Nihon Sun), Chris Peterson (MIT), Sam Shteingart (AT&T), Manish Sheth
(AT&T), Muneiyoshi Suzuki (NTT), Cori Mehring (Digital), Shoji Sugiyama (IBM), and Eiji
Tosa (IBM).
We are deeply indebted to Tatsuya Kato (NTT), Hiroshi Kuribayashi (OMRON), Seiji Kuwari
(OMRON), Muneiyoshi Suzuki (NTT), and Li Yuhong (OMRON) for producing one of the first
complete sample implementation of the internationalization facilities, and Hiromu Inukai (Nihon
Sun), Takashi Fujiwara (Fujitsu), Hideki Hiura (Sun), Yasuhiro Kawai (Oki Technosystems Labo-
ratory), Kazunori Nishihara (Fuji Xerox), Masaki Takeuchi (Sony), Katsuhisa Yano (Toshiba),
Makoto Wakamatsu (Sony Corporation) for producing the another complete sample implementa-
tion of the internationalization facilities.
The principal authors (design and implementation) of the Xcms color management facilities are
Al Tabayoyon (Tektronix) and Chuck Adams (Tektronix). Joann Taylor (Tektronix), Bob Toole
(Tektronix), and Keith Packard (MIT X Consortium) also contributed significantly to the design.
Others who contributed are: Harold Boll (Kodak), Ken Bronstein (HP), Nancy Cam (SGI), Donna
Converse (MIT X Consortium), Elias Israel (ISC), Deron Johnson (Sun), Jim King (Adobe),
Ricardo Motta (HP), Chuck Peek (IBM), Wil Plouffe (IBM), Dave Sternlicht (MIT X Consor-
tium), Kumar Talluri (AT&T), and Richard Verberg (IBM).
We also once again thank Al Mento of Digital for his work in formatting and reformatting text for
this manual, and for producing man pages. Thanks also to Clive Feather (IXI) for proof-reading
and finding a number of small errors.
Release 6
Stephen Gildea (X Consortium) authored the threads support. Ovais Ashraf (Sun) and Greg
Olsen (Sun) contributed substantially by testing the facilities and reporting bugs in a timely fash-
ion.
The principal authors of the internationalization facilities, including Input and Output Methods,
are Hideki Hiura (SunSoft) and Shigeru Yamada (Fujitsu OSSI). Although the words and much
of the design are due to them, many others have contributed substantially to the design and imple-
mentation. They are: Takashi Fujiwara (Fujitsu), Yoshio Horiuchi (IBM), Makoto Inada (Digital),
Hiromu Inukai (Nihon SunSoft), Song JaeKyung (KAIST), Franky Ling (Digital), Tom McFar-
land (HP), Hiroyuki Miyamoto (Digital), Masahiko Narita (Fujitsu), Frank Rojas (IBM),
Hidetoshi Tajima (HP), Masaki Takeuchi (Sony), Makoto Wakamatsu (Sony), Masaki Wakao
(IBM), Katsuhisa Yano(Toshiba) and Jinsoo Yoon (KAIST).
The principal producers of the sample implementation of the internationalization facilities are:
Jeffrey Bloomfield (Fujitsu OSSI), Takashi Fujiwara (Fujitsu), Hideki Hiura (SunSoft), Yoshio
Horiuchi (IBM), Makoto Inada (Digital), Hiromu Inukai (Nihon SunSoft), Song JaeKyung
(KAIST), Riki Kawaguchi (Fujitsu), Franky Ling (Digital), Hiroyuki Miyamoto (Digital),
Hidetoshi Tajima (HP), Toshimitsu Terazono (Fujitsu), Makoto Wakamatsu (Sony), Masaki
Wakao (IBM), Shigeru Yamada (Fujitsu OSSI) and Katsuhisa Yano (Toshiba).
The coordinators of the integration, testing, and release of this implementation of the internation-
alization facilities are Nobuyuki Tanaka (Sony) and Makoto Wakamatsu (Sony).
Others who have contributed to the architectural design or testing of the sample implementation
of the internationalization facilities are: Hector Chan (Digital), Michael Kung (IBM), Joseph
Kwok (Digital), Hiroyuki Machida (Sony), Nelson Ng (SunSoft), Frank Rojas (IBM), Yoshiyuki
Segawa (Fujitsu OSSI), Makiko Shimamura (Fujitsu), Shoji Sugiyama (IBM), Lining Sun (SGI),
Masaki Takeuchi (Sony), Jinsoo Yoon (KAIST) and Akiyasu Zen (HP).
Jim Gettys
Cambridge Research Laboratory
Digital Equipment Corporation
Robert W. Scheifler
Laboratory for Computer Science
Massachusetts Institute of Technology
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